A comparison of hoof lesions and behaviour in pregnant and early lactationheifers at housing

Lameness, hoof lesion development and behaviour were compared for two group s of 10 heifers: one in early pregnancy (PH), the other in early lactation (LH). Both groups were housed in the summer in cubicles under identical con ditions. Behavioural observations commenced immediately after housing, and then at 2, 4 and 6 weeks post-housing. Locomotion scores were assessed week ly, and feet were examined for lesions at approximately -1, 0, 1 and 2 mont hs after housing. All four feet were photographed, lesions were scored subj ectively for severity, and lesion size and position were estimated using im age analysis techniques. LH already had greater total lesion scores before housing. More severe linear lesions in the LH group were associated with re duced lying, and less idling, increased standing in cubicles and more distu rbed lying behaviour. (C) 2000 Harcourt Publishers Ltd.